<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>0</h1>
<h2>0</h2>
<script>
    let count = 0;
    setInterval(f,1000);
    function f(){
        count++;
        let h = document.querySelector("h1")
        h.innerText = count;
    }
    let num = 0;
    setInterval(function (){
        num++;
        let h = document.querySelector("h2")
        h.innerText = num;
    },100);
</script>
</body>
</html>